The joy in life is his who has the heart to demand it.

Fortune cannot aid those who do nothing.

We must all obey the great law of change. It is the most powerful law of nature.

My life didn't please me, so I created my life.

Insanity in individuals is rare - but in groups, parties, nations, and epochs, it is the rule.

I'm never going to be disabled. I'm sick of being so healthy.

People can tell you to keep your mouth shut, but that doesn't stop you from having your own opinion

Life is not an exact science, it is an art.

It is not how old you are, but how you are old.

Yesterday is dead, tomorrow hasn't arrived yet. I have just one day, and I'm going to be happy in it.

The earth is like a spaceship that didn't come with an operating manual.

One day you will ask me which is more important? My life or yours? I will say mine and you will walk away not knowing that you are my life.

Science is the outcome of being prepared to live without certainty and therefore a mark of maturity. It embraces doubt and loose ends.

You only live once, but if you do it right, once is enough.

If man limits himself to a satisfied animal existence, and asks from life only what such an existence can give, the higher values of life at once disappear.

There's no advantage to hurrying through life.

Life does not need to mutilate itself in order to be pure.

Sow a thought and you get an act; Sow an act and you get a habit; Sow a habit and you get a character; Sow a character and you get a destiny.

Concision in style, precision in thought, decision in life.

You can give in to the failure messages and be a bitter deadbeat of excuses. Or you can choose to be happy and positive and excited about life.

The historian looks backward. In the end he also believes backward.